I've read its not far away and (importantly for me) Samsung gs2 is not getting the update.
What I want to know is, if I root my phone ( step into the unknown for me) would I be able to install klp

If you can find a ROM for it - and for a still popular phone such as the Galaxy S2, you most likely will be able to - then yes, you will be able to install KLP on your phone. How well it will run, how supported the new features of KLP will be, and how much of an upgrade it will be from the current version of Android on the S2 are all questions that obviously are unknown at the moment.